From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sun, 27 Sep 2015 01:18:02 -0400
Subject: [PATCH] handle NaN health/absorb values and repair bad data


diff --git a/src/main/java/net/minecraft/server/EntityLiving.java b/src/main/java/net/minecraft/server/EntityLiving.java
index 9c9af548fe32ab1dd3eecdb4fe4aacf255b39e22..8cb1537114c4aa3d6835e46e9e70de2fa67fac6a 100644
--- a/src/main/java/net/minecraft/server/EntityLiving.java
+++ b/src/main/java/net/minecraft/server/EntityLiving.java
@@ -602,7 +602,13 @@ public abstract class EntityLiving extends Entity {
 
     @Override
     public void loadData(NBTTagCompound nbttagcompound) {
-        this.setAbsorptionHearts(nbttagcompound.getFloat("AbsorptionAmount"));
+        // Paper start - jvm keeps optimizing the setter
+        float absorptionAmount = nbttagcompound.getFloat("AbsorptionAmount");
+        if (Float.isNaN(absorptionAmount)) {
+            absorptionAmount = 0;
+        }
+        this.setAbsorptionHearts(absorptionAmount);
+        // Paper end
         if (nbttagcompound.hasKeyOfType("Attributes", 9) && this.world != null && !this.world.isClientSide) {
             this.getAttributeMap().a(nbttagcompound.getList("Attributes", 10));
         }
@@ -1051,6 +1057,10 @@ public abstract class EntityLiving extends Entity {
     }
 
     public void setHealth(float f) {
+        // Paper start
+        if (Float.isNaN(f)) { f = getMaxHealth(); if (this.valid) {
+            System.err.println("[NAN-HEALTH] " + getName() + " had NaN health set");
+        } } // Paper end
         // CraftBukkit start - Handle scaled health
         if (this instanceof EntityPlayer) {
             org.bukkit.craftbukkit.entity.CraftPlayer player = ((EntityPlayer) this).getBukkitEntity();
@@ -2909,7 +2919,7 @@ public abstract class EntityLiving extends Entity {
     }
 
     public void setAbsorptionHearts(float f) {
-        if (f < 0.0F) {
+        if (f < 0.0F || Float.isNaN(f)) { // Paper
             f = 0.0F;
         }
 
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
index 34a3e269c59d1797c764a2dc6c5ba9e646792084..2e8105fe1d0f5f953ac8ba94df3e8eb66b7813d7 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
@@ -1611,6 +1611,7 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
     }
 
     public void setRealHealth(double health) {
+        if (Double.isNaN(health)) {return;} // Paper
         this.health = health;
     }